The best way to get answer will be to talk to the person on the receiving end. What he likes.
But here are some other ideas.
Using hands. You can use them in different ways to stroke. Single hand, both hands. The motion can also be changed. Stroke it up and down, in a rotating motion while stroking up and down. Additionally, you can also caress the balls, inner thighs etc. You can do this both when you are sucking and not.
Some people love it sloppy. Use spit and make it really sloppy.
You can also create a suction instead of just going up and down. Just suck the head like a lollipop.
Use a lot of tongue, teeth (be careful with this). Mixing it up always makes the blowjob feel better. And always go deep and hold it.
Other small things that'll make a blowjob better for me are,
Slapping cock on face/tongue
Rubbing cock all over face
Pushing cock into the corner of cheeks.
Rubbing it across lips
Devil